Device for connecting two components

ABSTRACT

The tensioning mechanism ( 18 ) comprises a clamp bolt ( 28 ), arranged in a displaceable manner in a transverse bore ( 26 ) in the fitting plug ( 12 ) and two diametrically opposed retainers ( 34, 36 ) in the second component ( 14 ) which engage with an axially facing internal or external cone against a complementary internal or external cone on the clamp bolt ( 28 ) and, during tensioning, are tensioned with the same in a wedge fashion. According to the invention, the clamp bolt ( 28 ) comprises a frustum-shaped external cone ( 40 ), the base diameter of which is smaller than the diameter of the guide surface ( 62 ) thereof in the transverse bore ( 26 ).

DESCRIPTION

[0001] The invention relates to a device for connecting two components,in particular two tool parts, comprising a cylindrical fitting plugarranged on the first component, and comprising a radially projectingannular surface surrounding the fitting plug at its root, comprising acylindrical fitting bore arranged in the second component for receivingthe fitting plug, and comprising an annular surface surrounding thefitting bore at its edge, comprising a clamp bolt, which is movablyguided with a cylindrical guide surface in a transverse bore in thefitting plug, and has on its axially facing ends an internal or externalcone concentric with respect to said guide surface, and the length ofwhich clamp bolt is smaller than the diameter of the fitting plug in thearea of the transverse bore, and comprising two retainers, which areinserted into radial bores, which are diametrically opposed in the areaof the fitting bore and are preferably provided with an internal thread,and which retainers have an external or internal cone extending towardthe inside of the fitting bore and being complementary with respect tothe internal or external cone of the clamp bolt, and which retainers canbe tensioned wedge-like with the clamp bolt during the tensioningoperation, whereby the internal and external cones, which arecomplementary with respect to one another, have in pairs an axial shiftcausing during the tensioning operation the pulling of the fitting pluginto the fitting bore and a mutual pressing of the two annular surfacesagainst one another.

[0002] A clamp bolt having an internal cone at one end and an externalcone at the other end is known in a device of this type (EP-B 0547049).The one retainer is designed as a stop screw fixed in the secondcomponent, which stop screw has an internal cone cooperating with theexternal cone of the clamp bolt, whereas the other retainer is designedas a motion screw, which has an external cone engaging the internal coneof the clamp bolt. When during screwing in of the motion screw a bearingoccurs, then the forces introduced in this manner occur initially on theside of the motion screw. The clamp bolt is thereby first pressed on theside of the motion screw against the base of the transverse bore, whichfaces the end of the fitting plug, so that the fitting plug is pulledinto the fitting bore. This occurs directly thereafter also during amoving of the clamp bolt external cone onto the internal cone of theoppositely lying stop screw. As soon as a certain tensioning action hasoccurred, the transfer of the radial forces into an axial componentpressing the annular surfaces of the first and second components againstone another takes place. However, a portion of the torque introducedthrough the motion screw is utilized to overcome the friction of theclamp bolt in the transverse bore so that the annular surfaces on theside of the motion screw are pressed against one another with a greaterradial force than on the side of the stop screw. In this manner oneobtains on the side of the motion screw a higher rigidity than on theside of the stop screw. A tilting moment is applied during thetensioning operation onto the transverse bolt, which tilting moment inthe case of a shorter guide surface results in an edge pressing than inthe case of longer guide surfaces. Thus the longer the guide, the lessis it possible for the clamp bolt to tilt and the smaller are thefriction forces to be overcome.

[0003] Starting out from this the basic purpose of the invention is toimprove the known connecting device of the above-disclosed type in sucha manner that the torque produced during the tensioning operation istransferred better within the connecting device and, viewed over thecircumference, more evenly into the planar surface tensioning.

[0004] To attain this purpose the characteristic combinations disclosedin claims 1, 4, 6, 14, 19, 21, 27 are suggested. Advantageousembodiments and further developments of the invention can be taken fromthe dependent claims.

[0005] The inventive solution is mainly based on the knowledge that thecomplementary external and internal cones, which face one another, arein the bearing area not pressed against one another over their entirelength but merely over a relatively short distance. In order to be ableto guide the fitting plug of the first component into the fitting boreof the second component, it is necessary that the clamp bolt includingthe external cone is slightly shorter than the diameter of the fittingplug in the area of the transverse bore. The supporting length of theclamp bolt within the transverse bore is on the other hand optimizedaccording to the invention.

[0006] This can be achieved by mainly shortening the external cone ofthe clamp bolt. In order to make this possible, it is suggestedaccording to a first solution modification of the invention that theclamp bolt has at least one frustum-shaped external cone, which projectsbeyond the axially facing end, and the base diameter of which is smallerthan the diameter of the guide surface. The base diameter of theexternal cone is advantageously at a maximum 85%, preferably 60 to 75%,of the diameter of the guide surface. With this measure it is achievedthat also the height of the frustum-shaped external cone can be chosento be at a maximum 40%, preferably 10 to 30%, of the diameter of theguide surface so that altogether a shortened external cone and acorrespondingly longer guide surface is obtained.

[0007] According to an alternative or advantageous embodiment of theinvention, the clamp bolt has at least one frustum-shaped internal cone,the base diameter of which is at least 65%, advantageously 70 to 90%, ofthe guide diameter. In addition, it is advantageous when the height ofthe frustum-shaped internal cone is at a maximum 30%, preferably 10 to25%, of the guide diameter.

[0008] Also on the side of the retainers there exists the possibility ofa shortening of the external and internal cones. Thus, it is suggestedaccording to a preferred embodiment of the invention that one of the tworetainers, which is preferably designed as a stop screw, has afrustum-shaped internal cone, the height of which is at a maximum 30%,preferably 10 to 25%, of its thread diameter. It is in this casefurthermore possible that the base diameter of the internal cone is inthe respective retaining screw at least 70%, preferably 75 to 90%, ofits external or thread diameter.

[0009] On the other hand, one of the two retainers, which is preferablydesigned as a motion screw, is provided with a frustum-shaped externalcone, the height of which is at a maximum 40%, preferably 10 to 30%, ofits external or thread diameter, whereas the frustum diameter is atleast 40%, preferably 50 to 60%, of the external or thread diameter. Thefrustum diameter is thereby understood to be the smallest diameter andthe base diameter the largest diameter of a frustum of a cone.

[0010] A further alternative or advantageous embodiment of the inventionprovides that the clamp bolt has at least one frustum-shaped externalcone projecting beyond the axially facing end, the frustum diameter ofwhich external cone corresponds at least to 0.4 times the associatedbase diameter. The frustum diameter of the external cone formed on theclamp bolt corresponds advantageously to 0.6 to 0.9 times the associatedbase diameter.

[0011] A further preferred embodiment of the invention provides that theclamp bolt has at least one frustum-shaped internal cone arranged on theaxially facing end, the frustum diameter of which internal conecorresponds at least to 0.5 times, preferably 0.6 to 0.8 times theassociated base diameter.

[0012] On the other hand it is suggested according to the invention thatone of the retainers preferably designed as a stop screw has afrustum-shaped internal cone, the frustum diameter of which correspondsat least to 0.6 times, preferably 0.75 to 0.95 times the associated basediameter. It is furthermore advantageous when one of the retainerspreferably designed as a motion screw has a frustum-shaped externalcone, the frustum diameter of which corresponds to 0.4 times, preferably0.5 to 0.8 times the associated base diameter.

[0013] It is achieved with the above measures that the guide surface,with which the clamp bolt rests frictionally against the inner surfaceof the transverse bore, can be optimized in its length. In this mannerthe friction forces to be overcome are minimized and the surface bearingpressure is improved in the area of the annular surfaces, viewed overthe circumference.

[0014] In order to improve this further, it is suggested according to analternative and advantageous embodiment of the invention that one of theretainers is designed as a stop bolt fixed on the second component andthe other retainer as a motion screw operable during the tensioningoperation, and that the internal and external cones, which arecomplementary to one another, have on the side of the stop bolt asmaller cone angle than on the side of the motion screw. According to apreferred embodiment of the invention, the cone angles are on the sideof the stop bolt between 40 and 80°, whereas they are on the side of themotion screw 70 to 120°. The engaging internal and external cones actduring the tensioning operation as a type of a wedge, through which theradial movement of the motion screw and of the clamp bolt are partlytransferred into the axial planar surface tensioning. Due to theinventive varying cone angles on the side of the motion screw and of thestop bolt, varying axial components result percentally: with the smallercone angle on the side of the stop bolt one obtains an enlarged axialcomponent and thus a compensation of the friction losses of the clampbolt within the transverse bore.

[0015] The internal cones end advantageously on the frustum side in anenlarged bore. It is possible with this measure to utilize during thetensioning operation the full height of the internal cone without anydanger of jamming.

[0016] In order to additionally improve the friction relationships inthe threads, it is suggested according to a further preferred oralternative embodiment of the invention that at least one of theinternal threads in the second component is followed toward the fittingbore by a threadless guide and support portion for the respectiveretainer designed as a screw. With this a precise guiding and supportingof the respective screw is guaranteed mainly in the area of the internaland external cones engaging one another in pairs. Furthermore, the guidelength of the respective screw can be enlarged with this, with theresult that the tendency for the screw to tilt and thus the friction isreduced, with the result that even when using a normal thread highertorques can be transferred into a planar surface tensioning.

[0017] A further preferred or alternative embodiment of the inventionprovides that one of the retainers is designed as a head bolt, which hasan internal or external cone on its head side, and which can be insertedfrom the inside of the fitting bore into the associated radial bore.This measure achieves besides a secure seat of the retainer an improvedforce transfer at the transition points of the tensioning elementswithout the danger of swaging of material. It is particularlyadvantageous in this connection when the head bolt is inserted with itsshaft, which is designed thread free, and/or with its head part into theradial bore in a press fit, which radial bore is preferably designed asa stepped bore. However, it is basically here also possible that theclamp bolt with its shaft carrying an external thread is screwed intothe radial bore designed as a taphole. It is thereby important that thehead bolt with its at least partly cylindrical and/or conical head partis force-lockingly supported on a wall portion of the radial bore, whichwall portion is formed complementarily to the head part.

[0018] The invention will be discussed in greater detail hereinafter inconnection with the exemplary embodiments illustrated in the drawings,in which:

[0019]FIG. 1 is a longitudinal cross-sectional view of a tool couplingwith a planar surface tensioning;

[0020]FIG. 2 is a cross-sectional view of the tool coupling according toFIG. 1;

[0021]FIGS. 3a and 3 b show, respectively, a section of FIG. 1 with theinventive clamp bolt and a clamp bolt according to the known state ofthe art;

[0022]FIG. 4 is a longitudinal cross-sectional view of a tool couplingmodified compared to FIG. 1 with a planar surface tensioning.

[0023] The connecting devices illustrated in the drawings are used toreleasably couple components. “Components” are above and hereinafterunderstood to be primarily tool components, which house either a dowelor a fitting bore, thus in particular tool heads, tool shafts, adapterparts or intermediate elements, such as extension and reducingcomponents, adjusting heads, spindle-adapter flanges and, if necessary,a tool spindle.

[0024] The connecting device consists essentially of a fitting plug 12projecting axially beyond a first component 10, a fitting bore 16arranged in a second component 14, and a tensioning mechanism 18 to pullthe fitting plug 12 into the fitting bore 16 and to create a planarsurface tensioning between an annular surface 22 on the first component10, which annular surface 22 surrounds the fitting plug 12, and anannular surface 24 on the second component 14, in which annular surfaceis provided the fitting bore 16.

[0025] The tensioning mechanism 18 houses a clamp bolt 28, which ismovably arranged in a transverse bore 26 through the fitting pin 12, andtwo diametrically opposed retainers 34, 36, which are inserted intoradial bores 30, 32 in the second component. The retainer 34 accordingto FIGS. 1 and 2 is thereby designed as a stop screw fixed with its flathead 38 on the second component 14, whereas the retainer 36 forms amotion or tensioning screw. The clamp bolt 28 engages with its externalcone 40 an internal cone 42 of the adjacent stop screw 34, and has aninternal cone 44 at its end opposite the external cone 40 to receive anexternal cone 46 formed on the motion screw 36.

[0026] To create a connection between the two components 10, 14, thefitting plug 12 is, with the motion screw 36 being unscrewed, initiallyloosely guided into the fitting bore 22 of the second component 16 untilit engages the annular surfaces 22, 24. During the subsequent screwingof the motion screw 36 into the internal thread 32, an engagementinitially takes place between the motion screw 36 and the clamp bolt 28in the area of the opposing cone surfaces 44, 46. During the furthercourse of the tensioning operation, the clamp bolt 28 is moved with itsexternal cone 40 into the internal cone 42 until it engages the stopscrew 34. At this stage, the actual tensioning operation starts, duringwhich the tensioning forces F₁, F₂ introduced through the retainingscrews 36, 34 due to the axial shift, are transferred through theconical bearing surfaces into axial forces F_(A) pulling the fittingplug 12 into the fitting bore 20. The axial forces F_(A) causes a planarsurface tensioning on the annular surfaces 22, 24 of the first and thesecond components 10, 14, which planar surface tensioning is indicatedby the arrows 56. The axial forces F_(A) are thereby transferred throughthe clamp bolt 28 in the area of the base 50 of the transverse bore 26,which base faces the end 58 of the fitting plug, onto the fitting plug12 and thus onto the first component 10. On the other hand, thetensioning forces must in the area of the retaining screws 34, 36 beabsorbed by the respective internal thread 30, 32 within the wall of thesecond component 16.

[0027] As a comparison between the inventive clamp bolt 28 illustratedin FIG. 3a and the known clamp bolt according to the EP-B 0547049 as theillustration of FIG. 3b shows, there exists a significant difference inthe length of the external and internal cones 40, 44. The same is truefor the external cone 46 of the motion screw 36 and the internal cone 42of the stop screw 34. It is achieved with these measures that the lengthof the guide surface 62 of the clamp bolt 28 can at a given diameter ofthe fitting plug be enlarged by approximately 20%, with the result thatthe clamp bolt 28 is supported over a greater length in the transversebore 26 so that a lesser tendency to tip and a reduction of the frictionforces, which must be overcome, is achieved.

[0028] The same is true for the motion screw 36, the external cone 46 ofwhich is so short that its shaft is supported over a greater length inthe internal thread 32. This effect is expressed in FIGS. 3a and 3 b bythe dimension b, b′, which illustrates the difference in the open spaceof the tensioning-screw projection and in the tensioned state. The pathof movement of the motion screw is in the case of the inventiveexemplary embodiment according to FIG. 3a less than half the size thanin the known embodiment according to FIG. 3b. This means that the clampbolt during the tensioning operation must also be moved at acorrespondingly shorter path of movement b instead of b′. The shorterpath of movement has the result that masses must be moved to a lesserdegree with respect to the geometric centerpoint thereof, which massmovement could result in an unbalance. Due to the shorter path ofmovement, the balance symmetry in the tensioned state can be adjustedmore precisely than has heretofore been possible, which is of importancein particular for high tool speeds.

[0029] As can be seen particularly in FIGS. 1 and 3, the conicalexternal cone 40 of the clamp bolt 28, which cone projects beyond theaxially facing side, has a base diameter which is smaller than thediameter of the guide surface 62. The base diameter of the external cone40 is in the illustrated exemplary embodiment approximately 70% of theguide diameter, whereas the height of the frustum-shaped external coneis less than 20% of the guide diameter. The relative shortness of theexternal cone can also be quantified by the ratio between the frustumdiameter (smallest diameter) and the base diameter (largest diameter) ofa cone. In the case of the external cone 40 of the clamp bolt 28 thisratio is 0.8, whereas it is 0.5 in the case of the external cone 46 ofthe tensioning screw. Similar values result also for the internal cones42, 44, which also have a relatively low height.

[0030] Similar values result from a measurement of the external cone 46and the internal cones 42 and 44. The cone sections, in particular theinternal cones, are kept as short as it is needed for the carryinglength. A recess 64, 66 is provided in axial direction behind thecarrying cone area of the internal cones, into which recess canpenetrate the external cone during the tensioning operation withoutcontact taking into consideration all occurring measurementfluctuations.

[0031] The shortening of the external and internal cones results, on theside of the motion screw 36, in the advantage that there is obtained agreater guide length in the thread area. When up to now onlyapproximately ⅔ to ¾ of the thread length could be utilized, now theentire thread length is available for guiding for this case.

[0032] A further improvement of the guiding characteristics in the areaof the motion screw 36 can be achieved when the end of the radial bore32, which end faces the fitting bore, is designed as a threadless guidebore 70, and the motion screw 36 has a corresponding threadless guidesection 72 (compare FIG. 4). The threadless sections assure that themotion screw is guided with a lesser fit clearance in the critical areaof the cone-receiving means, and the thread receives primarily atensioning function in axial direction.

[0033] A further characteristic of the invention is that the cone angle(opening angle) of the cones, which are complementary to one another, islarger on the side of the motion screw 36 than on the side of the stopscrew 34. This has the result that on the side of the stop screw 34 agreater portion of the tensioning force F₂ is converted into the axialcomponent F_(A) than on the side of the motion screw 36 (tensioningforce F₁, axial force F_(A)). This measure compensates for the frictionlosses occurring during the tensioning operation in the area of thetransverse bore 26, which friction losses result in a reaction force F₂which is smaller compared with the tensioning force F₁, so that theplanar surface pressing 56 is comparatively measured.

[0034] The exemplary embodiment according to FIG. 4 differs from theexemplary embodiment according to FIG. 1 on the one hand in such amanner that on the side of the motion screw there is guided a threadlesssection 72 in a threadless part 70 of the radial bore 32. Furthermore,the retainer 34 is in this exemplary embodiment designed as a head bolt,which has an internal cone 42 on its head side, and which is eitherscrewed or pressed, forming a press fit, with its shaft 73 from theinside of the fitting bore 16 into the radial bore 30. The head part 74of the head bolt 34 has a cylindrical outer surface in the illustratedexemplary embodiment, and is positively supported in a wall portion 76of the radial bore 30 designed as a step bore, which wall portion iscomplementarily formed with respect to the cylindrical outer surface.

[0035] In summary the following is to be stated: The invention relatesto a device for connecting two components 10, 12, for example two toolparts. The first component 10 has thereby a cylindrical fitting plug 12,and an annular surface 22 projecting radially beyond the fitting plug12, whereas the second component has a cylindrical fitting bore 16 inorder to receive the fitting plug 12 and an annular surface 24surrounding the fitting bore 16. Furthermore, a tensioning mechanism 18is provided which assures, during the tensioning operation, that thefitting plug 12 is pulled into the fitting bore, and the annularsurfaces 22, 24 are thereby pressed against one another. The tensioningmechanism 18 houses a clamp bolt 28 movably arranged in a transversebore 26 of the fitting plug 12, and two retainers 34, 36, which arediametrically opposed in the second component 14 and which each restwith one face-side internal or external cone against a complementaryexternal or internal cone of the clamp bolt 28, and are during thetensioning operation tensioned thereby in a wedge-like fashion. Theclamp bolt 28 has according to the invention a frustum-shaped externalcone 40, the base diameter of which is smaller than the diameter of itsguide surface 62 in the transverse bore 26.

1. A device for connecting two components, in particular two tool parts,comprising a cylindrical fitting plug (12) arranged on the firstcomponent (10), and comprising a radially projecting annular surface(22) surrounding the fitting plug (12) at its root, comprising acylindrical fitting bore (16) arranged in the second component (14) forreceiving the fitting plug (12), and comprising an annular surface (24)surrounding the fitting bore at its edge, comprising a clamp bolt (28),which is movably guided with a cylindrical guide surface (62) in atransverse bore (26) in the fitting plug (12), and has on its axiallyfacing ends an internal or external cone (44, 40) concentric withrespect to said guide surface (62), and the length of which clamp boltis smaller than the diameter of the fitting plug (12) in the area of thetransverse bore (26), and comprising two retainers (34, 36), which areinserted into radial bores (30, 32), which are diametrically opposed inthe area of the fitting bore (16) and are preferably provided with aninternal thread, and which retainers have an external or internal cone(46, 42) extending toward the inside of the fitting bore (16) and beingcomplementary with respect to the internal or external cone (44, 40) ofthe clamp bolt (28), and which retainers can be tensioned wedge-likewith the clamp bolt (28) during the tensioning operation, whereby theinternal and external cones (42, 40; 44, 46), which are complementarywith respect to one another, have in pairs an axial shift (a) causingduring the tensioning operation the pulling of the fitting plug (12)into the fitting bore (16) and a mutual pressing of the annular surfaces(22, 24) against one another, wherein the clamp bolt (28) has at leastone frustum-shaped external cone (40) projecting over the face side, thebase diameter of which external cone is smaller than the diameter of theguide surface (62).
 2. The device according to claim 1, wherein the basediameter of the external cone (40) is at a maximum 85%, preferably 60 to75%, of the diameter of the guide surface (62).
 3. The device accordingto claim 1 or 2, wherein the height of the frustum-shaped external cone(40) is at a maximum 40%, preferably 10 to 30%, of the diameter of theguide surface (62).
 4. A device for connecting two components, inparticular two tool parts, comprising a cylindrical fitting plug (12)arranged on the first component (10), and comprising a radiallyprojecting annular surface (22) surrounding the fitting plug (12) at itsroot, comprising a cylindrical fitting bore (16) arranged in the secondcomponent (14) for receiving the fitting plug (12), and comprising anannular surface (24) surrounding the fitting bore at its edge,comprising a clamp bolt (28), which is movably guided with a cylindricalguide surface (62) in a transverse bore (26) in the fitting plug (12),and has on its axially facing ends an internal or external cone (44, 40)concentric with respect to said guide surface (62), and the length ofwhich clamp bolt is smaller than the diameter of the fitting plug (12)in the area of the transverse bore (26), and comprising two retainers(34, 36), which are inserted into radial bores (30, 32), which arediametrically opposed in the area of the fitting bore (16) and arepreferably provided with an internal thread, and which retainers have anexternal or internal cone (46, 42) extending toward the inside of thefitting bore (16) and being complementary with respect to the internalor external cone (44, 40) of the clamp bolt (28), and which retainerscan be tensioned wedge-like with the clamp bolt (28) during thetensioning operation, whereby the internal and external cones (42, 40;44, 46), which are complementary with respect to one another, have inpairs an axial shift (a) causing during the tensioning operation thepulling of the fitting plug (12) into the fitting bore (16) and a mutualpressing of the annular surfaces (22, 24) against one another, whereinthe clamp bolt has at least one frustum-shaped external cone projectingbeyond the axially facing ends, the height of which external cone is ata maximum 40%, preferably 10 to 30%, of the diameter of the guidesurface (62).
 5. The device according to one of the claims 1 to 4,wherein the clamp bolt (28) has at least one frustum-shaped internalcone (44), the base diameter of which is at least 65% of the guidediameter (62).
 6. A device for connecting two components, in particulartwo tool parts, comprising a cylindrical fitting plug (12) arranged onthe first component (10), and comprising a radially projecting annularsurface (22) surrounding the fitting plug (12) at its root, comprising acylindrical fitting bore (16) arranged in the second component (14) forreceiving the fitting plug (12), and comprising an annular surface (24)surrounding the fitting bore at its edge, comprising a clamp bolt (28),which is movably guided with a cylindrical guide surface (62) in atransverse bore (26) in the fitting plug (12), and has on its axiallyfacing ends an internal or external cone (44, 40) concentric withrespect to said guide surface (62), and the length of which clamp boltis smaller than the diameter of the fitting plug (12) in the area of thetransverse bore (26), and comprising two retainers (34, 36), which areinserted into radial bores (30, 32), which are diametrically opposed inthe area of the fitting bore (16) and are preferably provided with aninternal thread, and which retainers have an external or internal cone(46, 42) extending toward the inside of the fitting bore (16) and beingcomplementary with respect to the internal or external cone (44, 40) ofthe clamp bolt (28), and which retainers can be tensioned wedge-likewith the clamp bolt (28) during the tensioning operation, whereby theinternal and external cones (42, 40; 44, 46), which are complementarywith respect to one another, have in pairs an axial shift (a) causingduring the tensioning operation the pulling of the fitting plug (12)into the fitting bore (16) and a mutual pressing of the annular surfaces(22, 24) against one another, wherein the clamp bolt (28) has at leastone frustum-shaped internal cone (44), the base diameter of which is atleast 65% of the guide diameter (62).
 7. The device according to claim 5or 6, wherein the base diameter of the internal cone (44) of the clampbolt (28) is 70 to 90% of the guide diameter (62).
 8. The deviceaccording to one of the claims 1 to 7, wherein the clamp bolt (28) hasat least one frustum-shaped internal cone (44), the height of which isat a maximum 30%, preferably 10 to 25%, of the diameter of the guidesurface (62).
 9. The device according to one of the claims 1 to 8,wherein one of the two retainers, which is preferably designed as a stopscrew (34), has a frustum-shaped internal cone (43), the height of whichis at a maximum 30%, preferably 10 to 25%, of its thread diameter. 10.The device according to one of the claims 1 to 9, wherein one of the tworetainers, which is preferably designed as a stop screw (34), has afrustum-shaped internal cone (42), the base diameter of which is atleast 79%, preferably 75 to 90%, of its external or thread diameter. 11.The device according to one of the claims 1 to 10, wherein one of thetwo retainers, which is preferably designed as a motion screw (36), hasa frustum-shaped external cone (46), the height of which is at a maximum40%, preferably 10 to 30%, of its external or thread diameter.
 12. Thedevice according to claim 11, wherein the frustum diameter of theretainer designed as a motion screw (36) is at least 40%, preferably 50to 60%, of the external or thread diameter.
 13. The device according toone of the claims 1 to 12, wherein the clamp bolt (28) has at least onefrustum-shaped external cone (40) projecting beyond the axially facingend, the frustum diameter of which corresponds to 0.4 times theassociated base diameter.
 14. A device for connecting two components, inparticular two tool parts, comprising a cylindrical fitting plug (12)arranged on the first component (10), and comprising a radiallyprojecting annular surface (22) surrounding the fitting plug (12) at itsroot, comprising a cylindrical fitting bore (16) arranged in the secondcomponent (14) for receiving the fitting plug (12), and comprising anannular surface (24) surrounding the fitting bore at its edge,comprising a clamp bolt (28), which is movably guided with a cylindricalguide surface (62) in a transverse bore (26) in the fitting plug (12),and has on its axially facing ends an internal or external cone (44, 40)concentric with respect to said guide surface (62), and the length ofwhich clamp bolt is smaller than the diameter of the fitting plug (12)in the area of the transverse bore (26), and comprising two retainers(34, 36), which are inserted into radial bores (30, 32), which arediametrically opposed in the area of the fitting bore (16) and arepreferably provided with an internal thread, and which retainers have anexternal or internal cone (46, 42) extending toward the inside of thefitting bore (16) and being complementary with respect to the internalor external cone (44, 40) of the clamp bolt (28), and which retainerscan be tensioned wedge-like with the clamp bolt (28) during thetensioning operation, whereby the internal and external cones (42, 40;44, 46), which are complementary with respect to one another, have inpairs an axial shift (a) causing during the tensioning operation thepulling of the fitting plug (12) into the fitting bore (16) and a mutualpressing of the annular surfaces (22, 24) against one another, whereinthe clamp bolt (28) has at least one frustum-shaped external cone (40),which projects beyond the axially facing end, and the frustum diameterof which corresponds at least to 0.4 times the associated base diameter.15. The device according to claim 13 or 14, wherein the frustum diameterof the external cone (40) formed on the clamp bolt (28) corresponds to0.6 to 0.9 times of the associated base diameter.
 16. The deviceaccording to one of the claims 1 to 15, wherein the clamp bolt (28) hasat least one frustum-shaped internal cone (44) arranged on the axiallyfacing end, the frustum diameter of which internal cone corresponds atleast to 0.5 times, preferably 0.6 to 0.8 times, of the associated basediameter.
 17. The device according to one of the claims 1 to 16, whereinone of the retainers preferably designed as a stop screw (34) has aconical internal cone (42), the frustum diameter of which corresponds atleast to 0.6 times, preferably 0.7 to 0.95 times, of the associated basediameter.
 18. The device according to one of the claims 1 to 17, whereinone of the retainers preferably designed as a motion screw (36) has afrustum-shaped external cone (46), the frustum diameter of whichcorresponds at least to 0.4 times, preferably 0.5 to 0.8 times theassociated base diameter.
 19. A device for connecting two components, inparticular two tool parts, comprising a cylindrical fitting plug (12)arranged on the first component (10), and comprising a radiallyprojecting annular surface (22) surrounding the fitting plug (12) at itsroot, comprising a cylindrical fitting bore (16) arranged in the secondcomponent (14) for receiving the fitting plug (12), and comprising anannular surface (24) surrounding the fitting bore at its edge,comprising a clamp bolt (28), which is movably guided with a cylindricalguide surface (62) in a transverse bore (26) of the fitting plug (12),and has on its axially facing ends an internal or external cone (44, 40)concentric with respect to said guide surface (62) and the length ofwhich clamp bolt is smaller than the diameter of the fitting plug (12)in the area of the transverse bore (26), and comprising two retainers(34, 36), which are inserted into radial bores (30, 32), which arediametrically opposed in the area of the fitting bore (16) and arepreferably provided with an internal thread, and which retainers have anexternal or internal cone (46, 42) extending toward the inside of thefitting bore (16) and being complementary with respect to the internalor external cone (44, 40) of the clamp bolt (28), and which retainerscan be tensioned wedge-like with the clamp bolt (28) during thetensioning operation, whereby the internal and external cones (42, 40;44, 46), which are complementary with respect to one another, have inpairs an axial shift (a) causing during the tensioning operation thepulling of the fitting plug (12) into the fitting bore (16) and a mutualpressing of the annular surfaces (22, 24) against one another, whereinone of the retainers preferably designed as a stop screw (34) has aconical internal cone (42), the frustum diameter of which corresponds atleast to 0.6 times, preferably 0.7 to 0.95 times the associated basediameter.
 20. The device according to one of the claims 1 to 19, whereinone of the retainers is designed as a stop bolt fixed on the secondcomponent (14) and the other retainer as a motion screw (36) operableduring the tensioning operation, and wherein the internal and externalcones (42, 40; 44, 46), which are complementary to one another, have asmaller cone angle on the side of the stop bolt (34) than on the side ofthe motion screw (36).
 21. A device for connecting two components, inparticular two tool parts, comprising a cylindrical fitting plug (12)arranged on the first component (10), and comprising a radiallyprojecting annular surface (22) surrounding the fitting plug (12) at itsroot, comprising a cylindrical fitting bore (16) arranged in the secondcomponent (14) for receiving the fitting plug (12), and comprising anannular surface (24) surrounding the fitting bore at its edge,comprising a clamp bolt (28), which is movably guided with a cylindricalguide surface (62) in a transverse bore (26) in the fitting plug (12),and has on its axially facing ends an internal or external cone (44, 40)concentric with respect to said guide surface (62), and the length ofwhich clamp bolt is smaller than the diameter of the fitting plug (12)in the area of the transverse bore (26), and comprising two retainingscrews (34, 36), which are inserted into radial bores (30, 32), whichare diametrically opposed in the area of the fitting bore (16) and arepreferably provided with an internal thread, and which retaining screwshave an external or internal cone (46, 42) extending toward the insideof the fitting bore (16) and being complementary with respect to theinternal or external cone (44, 40) of the clamp bolt (28), and whichretaining screws can be tensioned wedge-like with the clamp bolt (28)during the tensioning operation, whereby the internal and external cones(42, 40; 44, 46), which are complementary with respect to one another,have in pairs an axial shift (a) causing during the tensioning operationthe pulling of the fitting plug (12) into the fitting bore (16) and amutual pressing of the annular surfaces (22, 24) against one another,wherein one of the retainers is designed as a stop bolt fixed on thesecond component (14), and the other retainer as a motion screw (36)operable during the tensioning operation, and wherein the internal andexternal cones (42, 40; 44, 46), which are complementary to one another,have a smaller cone angle on the side of the stop bolt (34) than on theside of the motion screw (36).
 22. The device according to claim 20 or21, wherein the cone angles are 40° to 80° on the side of the stop bolt(34) and 70° to 120° on the side of the motion screw (36).
 23. Thedevice according to one of the claims 1 to 20, wherein the internalcones (42, 44) end at their frustum side in an enlarged recess (64, 66).24. The device according to one of the claims 1 to 23, wherein at leastone of the internal threads (30, 32) provided in the second component(14) is followed toward the fitting bore (16) by a threadless guidingand supporting portion for the retainer (34, 36) designed as a screw.25. The device according to claim 24, wherein the retainer (34, 36)designed as a screw engages with a threadless shaft section the guidingand supporting portion.
 26. The device according to one of the claims 1to 15, wherein one of the retainers (34) is designed as a head bolt,which has the internal or external cone (42) on its head side, and whichcan be inserted from the inside of the fitting bore (16) into theassociated radial drilling (30).
 27. A device for connecting twocomponents, in particular two tool parts, comprising a cylindricalfitting plug (12) arranged on the first component (10), and comprising aradially projecting annular surface (22) surrounding the fitting plug(12) at its root, comprising a cylindrical fitting bore (16) arranged inthe second component (14) for receiving the fitting plug (12), andcomprising an annular surface (24) surrounding the fitting bore at itsedge, comprising a clamp bolt (28), which is movably guided with acylindrical guide surface (62) in a transverse bore (26) in the fittingplug (12), and has on its axially facing ends an internal or externalcone (44, 40) concentric with respect to said guide surface (62), andthe length of which clamp bolt is smaller than the diameter of thefitting plug (12) in the area of the transverse bore (26), andcomprising two retainers (34, 36), which are inserted into radial bores(30, 32), which are diametrically opposed in the area of the fittingbore (16) and are preferably provided with an internal thread, and whichretainers have an external or internal cone (46, 42) extending towardthe inside of the fitting bore (16) and being complementary with respectto the internal or external cone (44, 40) of the clamp bolt (28), andwhich retainers can be tensioned wedge-like with the clamp bolt (28)during the tensioning operation, whereby the internal and external cones(42, 40; 44, 46), which are complementary with respect to one another,have in pairs an axial shift (a) causing during the tensioning operationthe pulling of the fitting plug (12) into the fitting bore (16) and amutual pressing of the annular surfaces (22, 24) against one another,wherein one of the retainers (34) is designed as a head bolt, which isprovided with an internal or external cone (42) on its head side, andwhich can be inserted from the inside of the fitting bore (16) into theassociated radial drilling (30).
 28. The device according to claim 26 or27, wherein the head bolt (34) is pressed with its shaft (73), which isdesigned threadless, and/or with its head part (74) into the radial bore(30), which is preferably designed as a stepped bore.
 29. The deviceaccording to claim 26 or 27, wherein the head bolt (34) is screwed withits shaft carrying an external thread into the radial bore (30) designedas a taphole.
 30. The device according to one of the claims 26 to 29,wherein the head bolt (34) is force-lockingly supported with its headpart (74), which is at least partly cylindrical and/or conical, on awall portion (76) of the radial bore (30), which wall portion iscomplementarily formed with respect to the head part.